Description of the `nix nar cat` command

1st chunk of `src/nix/nar-cat.md`

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# Examples

* List a file in a [Nix Archive (NAR)][Nix Archive] and pipe it through `gunzip`:

  ```console
  # nix nar cat ./hello.nar /share/man/man1/hello.1.gz | gunzip
  .\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.4.
  .TH HELLO "1" "November 2014" "hello 2.10" "User Commands"
  …
  ```

# Description

This command prints on standard output the contents of the regular
file *path* inside the NAR file *nar*.

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Title: Description of the `nix nar cat` command

Summary

The `nix nar cat` command extracts and prints the contents of a specified file within a Nix Archive (NAR) to standard output. An example demonstrates how to list a file in a NAR and pipe it through `gunzip`.